Evidence markers are placed near a Capitol Police vehicle following a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

Evidence markers are placed near a Capitol Police vehicle following a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, ... more

An evidence marker is placed not far from a car following a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

An evidence marker is placed not far from a car following a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said ... more

Photo: AP

An evidence marker is placed not far from a car following a... Photo-5272710.71398 - Houston Chronicle

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Emergency personal help an injured person after a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

Emergency personal help an injured person after a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. ... more

Capitol Hill police officers huddle near a car following a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

Capitol Hill police officers huddle near a car following a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said ... more

Capitol Hill police officers look at a car following a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

Capitol Hill police officers look at a car following a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said ... more

Emergency personal wheel off an injured person after a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

Emergency personal wheel off an injured person after a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said ... more

Police respond to a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

Police respond to a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire ... more

A Washington police officer stands guard on Capitol Hill in Washington, Thursday, Oct. 3, 2013, after a report of a shooting. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

A Washington police officer stands guard on Capitol Hill in Washington, Thursday, Oct. 3, 2013, after a report of a shooting. A police officer was reported injured after gunshots at the U.S. Capitol, police ... more

Police respond to a reported shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

Police respond to a reported shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the ... more

This view is from the Russell Senate Office Building shows police converging on the scene of a shooting on Constitution Avenue on Capitol and near the Supreme Court in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

This view is from the Russell Senate Office Building shows police converging on the scene of a shooting on Constitution Avenue on Capitol and near the Supreme Court in Washington, Thursday, Oct. 3, 2013. A ... more

Photo: AP

This view is from the Russell Senate Office Building shows police... Photo-5272326.71398 - Houston Chronicle

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A member of the Secret Service Counter Assault team watches from the roof of the White House in Washington to survey the area, Thursday, Oct. 3, 2013, after reports of shot being fired on Capitol Hill. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

A member of the Secret Service Counter Assault team watches from the roof of the White House in Washington to survey the area, Thursday, Oct. 3, 2013, after reports of shot being fired on Capitol Hill. A police ... more

Photo: AP

A member of the Secret Service Counter Assault team watches from... Photo-5272382.71398 - Houston Chronicle

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Taboola Gallery Frame Item-85307.71398 - Houston Chronicle

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A U.S. Capitol police officer lies on the steps of the Senate with a gun drawn in response to a report of shots fired Thursday, Oct. 3, 2012. A police officer was reported injured after gunshots at the U.S. Capitol. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. (AP Photo/The Tampa Bay Times, Alex Leary) TAMPA OUT; CITRUS COUNTY OUT; PORT CHARLOTTE OUT; BROOKSVILLE HERNANDO OUT; USA TODAY OUT; MAGS OUT less

A U.S. Capitol police officer lies on the steps of the Senate with a gun drawn in response to a report of shots fired Thursday, Oct. 3, 2012. A police officer was reported injured after gunshots at the U.S. ... more

Photo: AP

A U.S. Capitol police officer lies on the steps of the Senate with... Photo-5272325.71398 - Houston Chronicle

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A Capitol Police officer runs through the first floor of the Senate on Capitol Hill in Washington, Thursday, Oct. 3,2013, during the lockdown order following a shooting on Constitution Avenue on Capitol Hll and near the Supreme Court. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

A Capitol Police officer runs through the first floor of the Senate on Capitol Hill in Washington, Thursday, Oct. 3,2013, during the lockdown order following a shooting on Constitution Avenue on Capitol Hll and ... more

Photo: AP

A Capitol Police officer runs through the first floor of the Senate... Photo-5272481.71398 - Houston Chronicle

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Police and federal agents converge on the scene of a shooting on Constitution Avenue on Capitol Hill near the Supreme Court in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

Police and federal agents converge on the scene of a shooting on Constitution Avenue on Capitol Hill near the Supreme Court in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after ... more

Photo: AP

Police and federal agents converge on the scene of a shooting on... Photo-5272383.71398 - Houston Chronicle

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Police and federal agents converge on the scene of a shooting on Constitution Avenue on Capitol Hill and near the Supreme Court in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

Police and federal agents converge on the scene of a shooting on Constitution Avenue on Capitol Hill and near the Supreme Court in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after ... more

Photo: AP

Police and federal agents converge on the scene of a shooting on... Photo-5272384.71398 - Houston Chronicle

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Taboola Gallery Frame Item-85307.71398 - Houston Chronicle

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Police and federal agents converge on the scene of a shooting on Constitution Avenue on the campus of the U.S. Capitol and near the Supreme Court, in Washington, Thursday, Oct. 3, 2013. The view is of Constitution and Delaware Ave., as seen from the Russell Senate Office Building. less

Police and federal agents converge on the scene of a shooting on Constitution Avenue on the campus of the U.S. Capitol and near the Supreme Court, in Washington, Thursday, Oct. 3, 2013. The view is of ... more

Photo: AP

Police and federal agents converge on the scene of a shooting on... Photo-5272386.71398 - Houston Chronicle

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A Capitol Hill police officer talks on a radio after a report of a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

A Capitol Hill police officer talks on a radio after a report of a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, ... more

Photo: AP

A Capitol Hill police officer talks on a radio after a report of a... Photo-5272328.71398 - Houston Chronicle

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Capitol Hill police on the scene of a shooting on Capitol Hill in Washington Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

Capitol Hill police on the scene of a shooting on Capitol Hill in Washington Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked ... more

Capitol Hill police officers respond to a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. (AP Photo/ Evan Vucci) less

Capitol Hill police officers respond to a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired ... more

Emergency personal wheel off an injured person after a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. (AP Photo/ Evan Vucci) less

Emergency personal wheel off an injured person after a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible ... more

Emergency personal help an injured person after a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. (AP Photo/ Evan Vucci) less

Emergency personal help an injured person after a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots ... more

Capitol Hill police officers respond to a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. (AP Photo/ Evan Vucci) less

Capitol Hill police officers respond to a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired ... more

US Park Police police on horseback patrol assist Secret Service during a shutdown Pennsylvania Ave., directly in front of the White House in Washington, Thursday, Oct. 3, 2013, after reports of shots on Capitol Hill. (AP Photo/Pablo Martinez Monsivais) less

US Park Police police on horseback patrol assist Secret Service during a shutdown Pennsylvania Ave., directly in front of the White House in Washington, Thursday, Oct. 3, 2013, after reports of shots on Capitol ... more

A Secret Service vehicle joins law enforcement officers on horseback from the US Park Police, as they shutdown access n Pennsylvania Ave., directly in front of the White House in Washington, Thursday, Oct. 3, 2013, after a shooting on Capitol Hill. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. (AP Photo/Pablo Martinez Monsivais) less

A Secret Service vehicle joins law enforcement officers on horseback from the US Park Police, as they shutdown access n Pennsylvania Ave., directly in front of the White House in Washington, Thursday, Oct. 3, ... more

A U.S. Park Police helicopter is loaded on the Mall in Washington, Thursday, Oct. 3, 2013, with a victim from a shooting. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. (AP Photo/Alex Brandon) less

A U.S. Park Police helicopter is loaded on the Mall in Washington, Thursday, Oct. 3, 2013, with a victim from a shooting. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible ... more

Photo: Associated Press

A U.S. Park Police helicopter is loaded on the Mall in Washington,... Photo-5272286.71398 - Houston Chronicle

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A U.S. Park Police helicopter is loaded on the Mall in Washington, Thursday, Oct. 3, 2013, with a victim from a shooting. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. less

A U.S. Park Police helicopter is loaded on the Mall in Washington, Thursday, Oct. 3, 2013, with a victim from a shooting. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible ... more

Photo: AP

A U.S. Park Police helicopter is loaded on the Mall in Washington,... Photo-5272245.71398 - Houston Chronicle

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Photo: Evan Vucci, AP

Capitol Lockdown Photo-5272310.71398 - Houston Chronicle

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Taboola Gallery Frame Item-85307.71398 - Houston Chronicle

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Sen. Jack Reed, D-R.I. watches at left as a Capitol Hill police officer puts on a his body armor after a reported shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

Sen. Jack Reed, D-R.I. watches at left as a Capitol Hill police officer puts on a his body armor after a reported shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported ... more

Capitol Hill police on the scene of a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

Capitol Hill police on the scene of a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked ... more

A member of the Secret Service Counter Assault team walks past the entrance of the White House in Washington, Thursday, Oct. 3, 2013, after reports of shot being fired on Capitol Hill.

A member of the Secret Service Counter Assault team walks past the entrance of the White House in Washington, Thursday, Oct. 3, 2013, after reports of shot being fired on Capitol Hill.

Photo: AP

A member of the Secret Service Counter Assault team walks past the... Photo-5272272.71398 - Houston Chronicle

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Police and federal agents converge on the scene of a shooting on Constitution Avenue on Capitol Hill near the Supreme Court in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

Police and federal agents converge on the scene of a shooting on Constitution Avenue on Capitol Hill near the Supreme Court in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after ... more

Photo: AP

Police and federal agents converge on the scene of a shooting on... Photo-5272422.71398 - Houston Chronicle

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Taboola Gallery Frame Item-85307.71398 - Houston Chronicle

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Police officers near the scene of a reported shooting outside the Hart Senate Office Building on Capitol Hill in Washington, Oct. 3, 2013. Witnesses reported hearing gunshots outside the Capitol after 2 p.m. on Thursday, sparking a huge police response and heightened security inside the Capitol, which was already tense during shutdown negotiations. (Doug Mills/The New York Times) less

Police officers near the scene of a reported shooting outside the Hart Senate Office Building on Capitol Hill in Washington, Oct. 3, 2013. Witnesses reported hearing gunshots outside the Capitol after 2 p.m. on ... more

A U.S. Park Police helicopter is loaded on the Mall in Washington, Thursday, Oct. 3, 2013, with a victim from a shooting. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. less

A U.S. Park Police helicopter is loaded on the Mall in Washington, Thursday, Oct. 3, 2013, with a victim from a shooting. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible ... more

Photo: AP

A U.S. Park Police helicopter is loaded on the Mall in Washington,... Photo-5272249.71398 - Houston Chronicle

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Capitol Hill police officers respond to a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. less

Capitol Hill police officers respond to a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired ... more

Police gather near the scene on Capitol Hill in Washington, Thursday, Oct. 3, 2013, after gunshots were heard. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots fired outside the building. (AP Photo/Alex Brandon) less

Police gather near the scene on Capitol Hill in Washington, Thursday, Oct. 3, 2013, after gunshots were heard. Police say the U.S. Capitol has been put on a security lockdown amid reports of possible shots ... more

Police and federal agents converge on the scene of a shooting on Constitution Avenue on the campus of the U.S. Capitol and near the Supreme Court, in Washington, Thursday, Oct. 3, 2013. The view is of Constitution and Delaware Ave., as seen from the Russell Senate Office Building. less

Police and federal agents converge on the scene of a shooting on Constitution Avenue on the campus of the U.S. Capitol and near the Supreme Court, in Washington, Thursday, Oct. 3, 2013. The view is of ... more

Photo: AP

Police and federal agents converge on the scene of a shooting on... Photo-5272421.71398 - Houston Chronicle

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A U.S. Capitol Police officer keeps watch on the steps of the Russell Senate Office Building on Capitol Hill near the Supreme Court in Washington, Thursday, Oct. 3, 2013, after a report of shots fired. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

A U.S. Capitol Police officer keeps watch on the steps of the Russell Senate Office Building on Capitol Hill near the Supreme Court in Washington, Thursday, Oct. 3, 2013, after a report of shots fired. A police ... more

Photo: AP

A U.S. Capitol Police officer keeps watch on the steps of the... Photo-5272576.71398 - Houston Chronicle

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A car sits on the grass near a security gate on Capitol Hill in Washington, Thursday, Oct. 3, 2013, after a report of shots fired. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

A car sits on the grass near a security gate on Capitol Hill in Washington, Thursday, Oct. 3, 2013, after a report of shots fired. A police officer was reported injured after gunshots at the U.S. Capitol, ... more

Photo: AP

A car sits on the grass near a security gate on Capitol Hill in... Photo-5272575.71398 - Houston Chronicle

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A fire truck leaves the scene of a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked down the entire complex, at least temporarily derailing debate over how to end a government shutdown. less

A fire truck leaves the scene of a shooting on Capitol Hill in Washington, Thursday, Oct. 3, 2013. A police officer was reported injured after gunshots at the U.S. Capitol, police said Thursday. They locked ... more

Law enforcement officials gather in the parking lot at Woodside Green Condominiums on Summer Street in Stamford, Conn. as part of the investigation into the shooting in Washington, DC earlier today, Thursday, Oct. 3, 2013. less

Law enforcement officials gather in the parking lot at Woodside Green Condominiums on Summer Street in Stamford, Conn. as part of the investigation into the shooting in Washington, DC earlier today, Thursday, ... more